linux-kernel - [PATCH 3/8] sdhci: Clear interrupt status register just once

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Date:	Wed, 14 Jul 2010 17:08:01 +0400
From:	Anton Vorontsov <avorontsov@...sta.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	Albert Herranz <albert_herranz@...oo.es>,
	Matt Fleming <matt@...sole-pimps.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Pierre Ossman <pierre@...man.eu>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH 3/8] sdhci: Clear interrupt status register just once

There's no need to clear the interrupt status register bit-by-bit,
we can just clear it once. This simplifies irq handler.

Signed-off-by: Anton Vorontsov <avorontsov@...sta.com>
---
 drivers/mmc/host/sdhci.c |   23 ++++++-----------------
 1 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 748a2e3..9ec245c 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1522,38 +1522,29 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 		goto out;
 	}
 
+	sdhci_writel(host, intmask, SDHCI_INT_STATUS);
+
 	DBG("*** %s got interrupt: 0x%08x\n",
 		mmc_hostname(host->mmc), intmask);
 
-	if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
-		sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
-			SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
+	if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE))
 		schedule_work(&host->card_detect_work);
-	}
 
 	intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
 
-	if (intmask & SDHCI_INT_CMD_MASK) {
-		sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
-			SDHCI_INT_STATUS);
+	if (intmask & SDHCI_INT_CMD_MASK)
 		sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
-	}
 
-	if (intmask & SDHCI_INT_DATA_MASK) {
-		sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK,
-			SDHCI_INT_STATUS);
+	if (intmask & SDHCI_INT_DATA_MASK)
 		sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
-	}
 
 	intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
 
 	intmask &= ~SDHCI_INT_ERROR;
 
-	if (intmask & SDHCI_INT_BUS_POWER) {
+	if (intmask & SDHCI_INT_BUS_POWER)
 		printk(KERN_ERR "%s: Card is consuming too much power!\n",
 			mmc_hostname(host->mmc));
-		sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
-	}
 
 	intmask &= ~SDHCI_INT_BUS_POWER;
 
@@ -1566,8 +1557,6 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 		printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
 			mmc_hostname(host->mmc), intmask);
 		sdhci_dumpregs(host);
-
-		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
 	}
 
 	result = IRQ_HANDLED;
-- 
1.7.0.5

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